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presto-main/src/main/java/com/facebook/presto/operator/RemoteProjectOperator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,197 @@ | ||
| /* | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.facebook.presto.operator; | ||
|
|
||
| import com.facebook.presto.common.Page; | ||
| import com.facebook.presto.common.block.Block; | ||
| import com.facebook.presto.metadata.FunctionManager; | ||
| import com.facebook.presto.spi.plan.PlanNodeId; | ||
| import com.facebook.presto.spi.relation.CallExpression; | ||
| import com.facebook.presto.spi.relation.ConstantExpression; | ||
| import com.facebook.presto.spi.relation.InputReferenceExpression; | ||
| import com.facebook.presto.spi.relation.RowExpression; | ||
| import com.google.common.collect.ImmutableList; | ||
|
|
||
| import java.util.Arrays; | ||
| import java.util.List; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import java.util.concurrent.ExecutionException; | ||
|
|
||
| import static com.google.common.base.Preconditions.checkState; | ||
| import static com.google.common.base.Throwables.throwIfUnchecked; | ||
| import static com.google.common.collect.ImmutableList.toImmutableList; | ||
| import static java.lang.String.format; | ||
| import static java.lang.Thread.currentThread; | ||
| import static java.util.Objects.requireNonNull; | ||
| import static java.util.concurrent.CompletableFuture.completedFuture; | ||
|
|
||
| public class RemoteProjectOperator | ||
| implements Operator | ||
| { | ||
| private final OperatorContext operatorContext; | ||
| private final FunctionManager functionManager; | ||
| private final List<RowExpression> projections; | ||
|
|
||
| private final CompletableFuture<Block>[] result; | ||
|
|
||
| private boolean finishing; | ||
|
|
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| private RemoteProjectOperator(OperatorContext operatorContext, FunctionManager functionManager, List<RowExpression> projections) | ||
| { | ||
| this.operatorContext = requireNonNull(operatorContext, "operatorContext is null"); | ||
| this.functionManager = requireNonNull(functionManager, "functionManager is null"); | ||
| this.projections = ImmutableList.copyOf(requireNonNull(projections, "projections is null")); | ||
| this.result = new CompletableFuture[projections.size()]; | ||
| } | ||
|
|
||
| @Override | ||
| public OperatorContext getOperatorContext() | ||
| { | ||
| return operatorContext; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean needsInput() | ||
| { | ||
| return !finishing && !processingPage(); | ||
| } | ||
|
|
||
| @Override | ||
| public void addInput(Page page) | ||
| { | ||
| checkState(!finishing, "Operator is already finishing"); | ||
| checkState(!processingPage(), "Still processing previous input"); | ||
| requireNonNull(page, "page is null"); | ||
| for (int channel = 0; channel < projections.size(); channel++) { | ||
| RowExpression projection = projections.get(channel); | ||
| if (projection instanceof InputReferenceExpression) { | ||
| result[channel] = completedFuture(page.getBlock(((InputReferenceExpression) projection).getField())); | ||
| } | ||
| else if (projection instanceof CallExpression) { | ||
| CallExpression remoteCall = (CallExpression) projection; | ||
| result[channel] = functionManager.executeFunction( | ||
| remoteCall.getFunctionHandle(), | ||
| page, | ||
| remoteCall.getArguments().stream() | ||
| .map(InputReferenceExpression.class::cast) | ||
| .map(InputReferenceExpression::getField) | ||
| .collect(toImmutableList())); | ||
| } | ||
| else { | ||
| checkState(projection instanceof ConstantExpression, format("Does not expect expression type %s", projection.getClass())); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public Page getOutput() | ||
| { | ||
| if (resultReady()) { | ||
| Block[] blocks = new Block[result.length]; | ||
| Page output; | ||
| try { | ||
| for (int i = 0; i < blocks.length; i++) { | ||
| blocks[i] = result[i].get(); | ||
| } | ||
| output = new Page(blocks); | ||
| Arrays.fill(result, null); | ||
| return output; | ||
| } | ||
| catch (InterruptedException ie) { | ||
| currentThread().interrupt(); | ||
| throw new RuntimeException(ie); | ||
| } | ||
| catch (ExecutionException e) { | ||
| Throwable cause = e.getCause(); | ||
| if (cause != null) { | ||
| throwIfUnchecked(cause); | ||
| throw new RuntimeException(cause); | ||
| } | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
|
|
||
| @Override | ||
| public void finish() | ||
| { | ||
| finishing = true; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean isFinished() | ||
| { | ||
| return finishing && !processingPage(); | ||
| } | ||
|
|
||
| private boolean processingPage() | ||
| { | ||
| // Array result will be filled with nulls when getOutput() produce output. | ||
| // If result has non-null values that means input page is in processing. | ||
| for (int i = 0; i < result.length; i++) { | ||
| if (result[i] != null) { | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| private boolean resultReady() | ||
| { | ||
| for (int i = 0; i < result.length; i++) { | ||
| if (result[i] == null || !result[i].isDone()) { | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
|
|
||
| public static class RemoteProjectOperatorFactory | ||
| implements OperatorFactory | ||
| { | ||
| private final int operatorId; | ||
| private final PlanNodeId planNodeId; | ||
| private final FunctionManager functionManager; | ||
| private final List<RowExpression> projections; | ||
| private boolean closed; | ||
|
|
||
| public RemoteProjectOperatorFactory(int operatorId, PlanNodeId planNodeId, FunctionManager functionManager, List<RowExpression> projections) | ||
| { | ||
| this.operatorId = operatorId; | ||
| this.planNodeId = requireNonNull(planNodeId, "planNodeId is null"); | ||
| this.functionManager = requireNonNull(functionManager, "functionManager is null"); | ||
| this.projections = ImmutableList.copyOf(requireNonNull(projections, "projections is null")); | ||
| } | ||
| @Override | ||
| public Operator createOperator(DriverContext driverContext) | ||
| { | ||
| checkState(!closed, "Factory is already closed"); | ||
| OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, planNodeId, RemoteProjectOperator.class.getSimpleName()); | ||
| return new RemoteProjectOperator(operatorContext, functionManager, projections); | ||
| } | ||
|
|
||
| @Override | ||
| public void noMoreOperators() | ||
| { | ||
| closed = true; | ||
| } | ||
|
|
||
| @Override | ||
| public OperatorFactory duplicate() | ||
| { | ||
| return new RemoteProjectOperatorFactory(operatorId, planNodeId, functionManager, projections); | ||
| } | ||
| } | ||
| } |
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